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utilizing the clock to result in an Consider circuit that uses the plurality of delayed monotone alerts to detect a clock fault.
A further facet of the invention may perhaps reside in an equipment for detecting clock tampering, comprising a circuit that gives a monotone sign, a plurality of resettable delay line segments, and an evaluate circuit. The circuit gives the monotone sign throughout a clock Examine time period connected with a clock. The plurality of resettable delay line segments delay the monotone signal to crank out a respective plurality of delayed monotone signals.
ten. The apparatus for detecting clock tampering as defined in declare eight, wherein the means for triggering the indicates for evaluating uses a clock edge at an conclude in the clock Examine time period to induce the implies for assessing.
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suggests for delaying the monotone sign to deliver a plurality of delayed monotone indicators owning discretely expanding delay situations amongst a least hold off time and a highest hold off time and every in the plurality of delayed monotone alerts having possibly a one or maybe a zero logic value;
Resettable delay line segments involving a resettable hold off line segment connected with a minimal delay time along with a resettable delay line phase connected with a utmost delay time are Every connected to discretely raising hold off instances. The Assess circuit is induced from the clock and uses the plurality of delayed monotone alerts to detect a clock fault.
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34. The equipment for detecting voltage tampering as defined in declare 33, wherein the h2o level range is determined dependant on delayed monotone signals from one or more preceding evaluate time.
39. The apparatus for detecting voltage tampering as outlined in claim 37, wherein the Assess circuit is brought on by a clock edge at an conclude of the Consider period of time.
Really substantial continual condition frequency detection relies on the delay concerning the reset operators of your shortest hold off line. The shorter the time necessary to reset this hold off line, the shorter some time basically allotted to reset the hold off line might be.
The reset time frame might be prior to the Examine period of time 310. Using the clock CLK to cause the Appraise circuit 220 could utilize a clock edge at an finish of the Assess time frame to induce the Assess circuit.
In-frame design permits clock for being accessed for adjustment or battery adjust without having eliminating metal housing
A different element of the invention may perhaps reside within an equipment for detecting clock tampering, comprising: suggests for offering a monotone sign during a clock Examine time frame affiliated with a clock; means for delaying the monotone signal employing a plurality of resettable delay line segments to produce a respective plurality of delayed monotone indicators getting discretely expanding delay periods involving a minimal hold off time plus a greatest delay time; and indicates for utilizing the clock to trigger an Consider circuit that employs the plurality of delayed monotone signals to detect a clock fault.